• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.26 no.1
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• pp.59-65
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• 2017

A seat track product is a car seat part that provides a base for vehicle seats. An ultra-high strength steel sheet is used to reduce the weight of vehicle body parts. However, the formability of an ultra-high strength steel sheet is poor because of its very low elongation and very high elastic deformation. For this reason, a new forming technology of an ultra-high strength steel sheet is required. The influence of spring-back of seat track parts on the shape freeze in forming processes was investigated to be solved by adjusting the appropriate tool design such as minus clearance between punch and die, and punch angle. This paper describes how to apply the spring-back prevention technique for improving shape freeze by using the ultra-high strength steel sheet with 980MPa to develop lightweight seat tract parts.

• Transactions of the Korean Society of Automotive Engineers
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• v.12 no.1
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• pp.145-152
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• 2004

This paper compares seat vibrations of a small passenger car and a SUV. The results also include the comparison of the human body accelerations and the ride values, such as the component ride values, and SEAT values of 12 axis accelerations obtained at the human body and seat track. The ride comfort evaluation is usually carried out by experiments of real cars which are expensive and sometimes may contain errors by passenger's postures. Simulations by computer, on the other hand, enable to solve these problems when the accuracy is proven. This paper, thus, also shows the correlation of human body vibration between experiments and computer simulations. For the computer simulation, korean dummy models are developed from the Hybrid III models by scaling the body data of Hybrid III to those of Korean men and women. From the comparison between the test data and simulation data, a nice correlation in trends was shown.

• Proceedings of the ESK Conference
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• 1997.10a
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• pp.120-127
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• 1997

오늘날 자동차는 자동차 자체에 대한 기능적 측면뿐만 아니라 운전자 및 탑승자에게 적절한 거주 공간을 제공하여야 한다는 인간공학적 측면을 동시에 만족시켜야 한다. 특히 부적절한 거주 공간에서 비롯된 좋지 않은 운전 자세는 운전시 신체 각 부위에 과다한 피로를 유발시키고 운전 성능에도 영향 을 미칠 수 있기 때문에 안전 측면에서도 매우 중요하다. 거주 공간의 설계시 출발점이 되는 것은 SgRP(Seating Reference Point)이며 이의 설정은 운전 자세에 직접적인 영향을 미치므로 운전자의 불편도 (Discomfort)를 최소로 하며 운전성능을 높일 수 있도록 설정되어야한다. 본 연구에서는 Driving Simulator 를 이용하여 운전자가 취할 수 있는 Seat의 전후, 상하 위치에 따른 여러 운전 자세에서 운전자가 느끼는 불편도 및 각종 Control의 조작성등의 주관적인 Measure와 운전시의 운전성능을 나타내는 객관적 Measure를 측정, 평가하였다. Seat의 위치는 Whole Body Discomfort, Steering Wheel, Gear, Pedal의 조작성 등의 주관적 종속 변수에는 유의한 영향을 미치는 것으로 나타났으며, 객관적 종속변수에는 유의한 영향이 나타 나지 않았다. 실험 결과를 바탕으로 Regression식을 도출하였으며 이를 바탕으로 Isocomfort Surface를 제시 하였다. 본 연구의 결과는 한국인에 적합한 SgRP 및 Seat Track 설정의 자료로 활용될 수 있을 것으로 기대 된다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.2
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• pp.702-709
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• 2018

A quick-hardened concrete track was developed to improve the aged ballasted track to a concrete track, and applied to earthworks and tunnels of main and urban railways. Rebars for reinforcement are not generally applied to prestressed concrete sleepers. On the other hand, many cracked sleepers have been observed in railroad sites. A wide sleeper, which is one of the main components of quick-hardened concrete track, should be structurally safe and crack-resistant in a ballasted and concrete track to avoid this problem. In particular, a wide sleeper manufactured by a post-tension method must have reinforcing bars applied to the rail-seat section. In this paper, static tests, dynamic tests, and fatigue tests were carried out to compare the flexural strength and crack resistance performance of a wide sleeper with and without reinforcing bars for a quick-hardened concrete track. As a result of the test, if some reinforcing bars are applied appropriately to the rail-seat section of a wide sleeper, it will be possible to prevent the occurrence of cracks, delay the expansion of the crack width, and the flexural fracture.

• Journal of Arbitration Studies
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• v.16 no.3
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• pp.217-230
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• 2006

Singapore is a dual-track arbitration regime. Where seat of arbitration is Singapore, the governing procedural law for domestic arbitration is AA and for international arbitration is IAA. The parties may by agreement opt-out of and opt-into a specific regime. SIAC is a leading arbitral institution in Singapore. It offers wide range of services: administer arbitration proceedings, arrangement of logistics for arbitration hearing, appointment of arbitral tribunal for ad hoc arbitration in Singapore as well as registry and authentication of arbitral awards.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.19 no.7
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• pp.41-51
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• 2020

This paper presents the development of a robotic system for rehabilitation of the trunk's ability to maintain postural control under different balance conditions. The system, developed with extensive input from rehabilitation and biomedical engineering experts, consists of a seat mounted on a robotic mechanism capable of moving it with four degrees of freedom (3 rotational and 1 translational). The seat surface has built in instrumentation to gauge the movements of the user's center of pressure (COP) and it can be moved either to track the movements of the COP or according to operator given commands. The system allows two types of leg support. A ground mounted footrest allows participation of legs in postural control while a seat connected footrest constrains the leg movement and limits their involvement in postural control. The design evolution over several prototypes is presented and computer aided structural analysis is used to determine the feasibility of the designed components. The system is pilot tested by a stroke patient and is determined to have potential for use as a trunk rehabilitation tool. Future works involve more detailed studies to evaluate the effects of using this system and to determine its efficacy as a rehabilitation tool.

• Journal of IKEEE
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• v.26 no.4
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• pp.602-613
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• 2022

This paper proposes an algorithm for correcting indirect situations resulting from the wheelchair moving the stairs with wheel-type caterpillar and seat position variable. For analyzing the Yawing movement model, the change of Yaw value was estimated using Roll, Pitch, and Yaw in the driving environment, and it was used as a control variable and the information of the wheel drive controller. The verification confirmed the correction of about 10° of Yawing movement within about 7 seconds. It was confirmed that the angular velocity was reduced by 47.5% in seat position change.

• Transactions of the Korean Society of Automotive Engineers
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• v.3 no.2
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• pp.16-29
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• 1995

In this study a tracked vehicle is idealized as a 2-dimensional 9-degrees-of-freedom model which takes into account the effects of HSU units, torsion bars, and track. For the model equations of motion are derived using Kane's method. By using the equations of motion, a numerical example is solved and results are compared to those obtained by using a general purpose multi body dynamic analysis program. The comparison study shows the reasonable coherence between the two results. which confirms the effectiveness of the model. With the model, dynamic response optimization is carried out. The objective function is the peak value of the vertical acceleration of the vehicle at the driver's seat, and the constraints are the wheel travel limits, the ground clearance. and the limits of other design variables. Three different sets of design variables are chosen and used for the optimization. The results show the attenuation of the acceleration peak value. Thus the procedure presented in this study can be utilized for the design improvement of the real system.